12=x+(-9)+

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Solution for 12=x+(-9)+ equation: 



12=x+(-9)+

We move all terms to the left:

12-(x+(-9)+)=0



We calculate terms in parentheses: -(x+(-9)+), so:

x+(-9)+

We add all the numbers together, and all the variables

x

Back to the equation:

-(x)



We add all the numbers together, and all the variables

-1x+12=0

We move all terms containing x to the left, all other terms to the right

-x=-12

x=-12/-1

x=+12

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